CA1070110A - Footwear, process and device for the production thereof - Google Patents
Footwear, process and device for the production thereofInfo
- Publication number
- CA1070110A CA1070110A CA290,089A CA290089A CA1070110A CA 1070110 A CA1070110 A CA 1070110A CA 290089 A CA290089 A CA 290089A CA 1070110 A CA1070110 A CA 1070110A
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- Prior art keywords
- top sheet
- mould
- footwear
- process according
- foot
- Prior art date
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- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The specification describes footwear including:
sandals, sport shoes, house shoes and the like, and a process for the production of such footwear. The shoe includes a foot form bed, the upper side of which includes at least one pre-formed and shape-retaining top sheet. The upper surface of the top sheet is curved to conform to the arch of the foot and is fixedly connected to the foot form bed. In producing the footwear, the liquid working material is poured into a mould which is open on top. The top sheet is produced separately from the foot form bed and the shape-retaining top sheet is then placed onto the open mould, such that it forms a seal for the mould cavity.
The specification describes footwear including:
sandals, sport shoes, house shoes and the like, and a process for the production of such footwear. The shoe includes a foot form bed, the upper side of which includes at least one pre-formed and shape-retaining top sheet. The upper surface of the top sheet is curved to conform to the arch of the foot and is fixedly connected to the foot form bed. In producing the footwear, the liquid working material is poured into a mould which is open on top. The top sheet is produced separately from the foot form bed and the shape-retaining top sheet is then placed onto the open mould, such that it forms a seal for the mould cavity.
Description
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1 The invention relates to footwear, in particular to a sandal, sport shoe, house shoe or the like having an optionally coated foot form bed made of plastics and optionally an outsole.
. 5 The invention further relates to processes and ; devices for the production of this footwear.
; Footwear of the known type having a foot bed opti-mally adapted to the arch of the foot, the socalled foot form bed, supplies the natural support required for the human foot and to a large extent prevents malformations of the foot, i.e., of permanent deviations from the normal shape of the foot, such as flat or splay foot or the like, which impede the function of the foot. This type of footwear often has the form of sandals, especially exercise sandals, which are marketed provided with various coatings or also in the uncoated state. The foot form bed adapted to the arch of the foot consists entirely of wood or entirely of plastics.
The advantages of the foot form bed made of wood are the image of the natural product, high breaking strength and the ability to absorb moisture and thus prevent perspiration.
The disadvantages of wood are its comparatively high specific gravity, and the many processing operations required in produc-tion, such as sawing, milling, grinding and polishing. The advantages of the foot form bed made of plastics are elasticity, low specific gravity and few processing operations required in production. The disadvantages are impermeability to moisture - and the need to embed reinforcements for stiffening in many ....
cases.
It is the object of the invention to unite the advan-` 30 tages of these working materials and to provide footwear which .` ~
, .
1 is compatible to the shape of the foot and at the same time wear-resistant and easy to produce.
This object is achieved according to the invention in footwear of the type initially mentioned by providing on the upper side of the foot form bed, facing the foot, at least one preformed and shape-retaining top sheet made of wood, leather, fibrous material or similar porous and gripping mater-ial, preferably adapted in shape and size, the upper surface of the top sheet being curved conforming to the arch of the foot and the top sheet being fixedly connected to the foot form bed made of plastic material.
In this embodiment, the foot form bed adapted to the arch of the foot consists of two nondeformable and rigidly connected parts, with the anatomically correct position of the foot on the top sheet consisting of wood, leather, fibrous . material or the like porous and gripping materials being secured.
The grip, porosity and sweat-absorbing capacity of these working materials secure excellent tread and walking properties and, connected with the plastics materials, give the appropriate strength to the footwear. Being adapted to the arch of the foot particularly means that the upper surface of the top sheet below the arch of the toes is provided with a bead starting at the outer edge of the sole, rising towards the middle toe and then steeply dropping again, and merging with, a depression provided for the ball of the big toe.
According to the invention, the shape-retaining top sheet is embodied as a shell-shaped form body which is thin-walled in comparison to the foot form bed. The wall thickness of the form body is preferably uniform throughout, but it can also vary, for instance in order to achieve greater flexibility ~ .
~ ~ .
1 in the area of the ball than the jolnt. The shell-shaped form ; body can be produced completely separate from the basic body made of plastic material.
' In order to improve the connection between the S assembly and the basic body and the stiffness, it is practical in many instances to provide the shape-retaining top sheet on its underside facing the foot form bed with reinforcing materials, for instance plastic materials reinforced with fibres, option-ally with textile, glass ~der polyester fibers, in the form ; 10 of a coating.
According to a further favourable embodiment of the invention, the top sheet is fixedly connected, for instance by means of casting or injection moulding, to the foot form bed which preferably consists of foamed or expanded materials.
; 15 But it is also possible to connect the top sheet to the foot form bed by form-fitting or friction. For this purpose, it is practical to provide the top sheet on its lower side facing the foot form bed and abutting same with projections and/or recesses such as pegs, nubs or the like which are engageable with corresponding projections and/or recesses in the upper side of the foot form bed. These formations have the additional ad-vantage that the two individual parts making up the foot form .
bed can be produced, stored and shipped completely independent ~ from one another. Moreover, the top sheet and basic body can :~ 25 be simply replaced if necessary.
- In the process for the production of the footwear ` according to the invention, the liquid material intended for the production of the foot form bed is charged into a mould open on top. The process is characterized in that first, the top sheet is produced independent of the foot form bed made of '' :; ' ', ' :
1 plastic material and the shape-retaining top sheet is then applied to the open mould, with the top sheet preferably being slightly larger than the finished footwear so that the top sheet forms a seal for the mould cavity.
According to the process of the invention, the top sheet is Eormed by means of hot pressing. This method is known per se for the processing of wood.
According to a further embodiment of the process indicated above, the top sheet is formed by applying a vacuum.
This process step has the advantage that the sheet of wood is dried during the shaping, since the water content is sucked off by means of the vacuum to a large extent and within a short time without having to apply much heat to the mould.
` A further possibility is to apply a coating of liquid synthetic resin and optionally a reinforcement to the top sheet and subsequently pressing it.
~ further process according to the invention for the production of the subject footwear under use of a mould which is filled from the outside in a closed state by means of a pouring channel is characterized in that first, the top sheet if formed separately from the body of plastic material, for instance by means of hot pressing, vacuum shaping or pressing with synthetic resin, is then inserted in the preformed state into the mould cavity prior to the injection operation, and that the foot form bed is then formed onto the top sheet by ~ injecting plastic material into the mould cavity. This means - that the top sheet itself forms one of the definitions of the ` mould cavity, which greatly simplifies matters. This also applies to the process mentioned in the first place.
According to this process, the dimensions of the . - 4 -` ~9'7~0 preformed top sheet are, preferably all around, slightly larger than the dimensions of the finished footwear. The top sheet thus simultaneously secures a seal for the mould cavity and prevents the working material injected into the mould cavity from escaping to the upper surface, i.e., the treading surface, of the top sheet.
According to this process, it is further practical when the curves of the preformed top sheet on inserting it into the mould cavity are more pronounced, preferably in all directions, than the curves in the finished footwear. This makes possible an expansion compensation so that a largely tension-free connection between top sheet and basic body is achieved. This also applied to the process first mentioned.
The device according to the invention for carrying out the process first mentioned, with at least one upper mould and one lower mould movable in respect of one another, is characterized in that the mould cavity is formed in the lower mould and that the underside of the upper mould is formed - complementary to the upper surface of the top sheet, the upper 20 side of the lower mould being provided along the edge of the mould cavity with an, in particular peripheral, depression for supporting the top sheet.
The device according to the invention for carrying out the process mentioned in the second place, with a mould which is filled in the closed state from the outside through a pouring channel, consisting of at least one upper mould and at least one lower mould which are arranged movable in respect of one another, in particular in a moulding frame, is characterized in that the upper side of the lower mould is formed complementary to the upper surface of the top sheet and is provided with an, :' ' :
7q~
1 in partlcular peripheral, depression forming a support for the top sheet.
These devices secure a simple and rational connection - between the shape-retaining top sheet and the basic body or the forming of the basic body onto the top sheet.
The invention is explained in detail with reference to the accompanying drawing showing some embodiments of the object of the invention.
Figure 1 shows a top sheet for a first embodiment . 10 of the footwear according to the invention in perspective, Figure 2 the uncoated foot form bed associated with . the top sheet according to Figure 1, also in perspective, . Figure 3 a plan view of the footwear consisting of the top sheet according to Figure 1 and the foot form bed according to Figure 2, :. Figure 4 a section along line IV-IV in Figure 3, . Figure 5 a section along line V-V in Figure 3, Figure 6 a section along line VI-VI in Figure 3, . Figure 7 a section along line VII-VII in Figure 3, . 20 Figure 8 a top sheet for a second embodiment of . footwear according to the invention, .~ Figure 9 the foot form bed associated with the top sheet according to Figure 8, in perspective, ` Figure 10 the foot form bed according to Figure 9, .. 25 but without a coating, Figure 11 the footwear, in plan view, consisting of the top sheet according to Figure 8 and the foot form bed `. according to Figure 9, Figure 12 a section along line XII-XII in Figure 11, Figure 13 a detail of Figure 12 in enlarged scale, .
' :
1 Figure 14 a section along line XIV-XIV in Figure 11, Figure 15 a section along line XV-XV in Figure 11, Figure 16 a section along line XVI-XVI in Figure 11, Figure 17 a section of a first embodiment of a device according to the invention for the production of the footwear disclosed and Figure 18 a section of a second embodiment of a device according to the invention for the production of the footwear disclosed.
The footwear shown in Figure 1 to 7 has the form of an uncoated sandal and consists of a shape-retaining top sheet 1 of wood foil or wood veneer, a foot form bed 2 of plastic material and a strap (not shown in detail) by means of which the foot form bed is held to the foot. The top sheet 1, which is formed as a shape-retaining form body of shell-shape and is thin-walled in comparison to the foot form bed, just like the upper surface of the foot form bed 2 matches the arch of the foot. This means that the upper surface of the top sheet 1 or the foot form bed 2 according to Austrian Patent No. 233,437 is provided underneath the arch of the toes with a bead 3 starting at the outer edge of the sole, rising towards the middle toe -and steeply dropping off into, and merging with, a depression 4 provided for the ball of the big toe. A shallow depression ; 5 is provided for the heel.
The top sheet 1 is adapted in shape and size to the foot form bed serving as a basic body, it is fixedly connected to the foot form bed 2 by direct moulding, optionally under use of an adhesive agent. To improve the stiffness, it is - possible to coat the sheet 1 on its upper surface abutting the foot form bed 2 with reinforcing materials prior to this opera-~)7~
1 tion. It is essential that the top sheet 1 be shape-retaining and preformed, with the wall thickness of the top sheet 1 being uniform throughout, essentially, while it can also have walls of varying thickness, for instance in order to achieve greater flexibility in the area of the ball than in the joint.
The top sheet 1 preferably has a thickness of 0.5 to 3 mm, in the case of wood veneer, of in particular 0.5 to 1.2 mm, preferably 0.5 to 0.7 mm, when in the form of a sheet of plastic material, in particular of 1 to 3 mm.
The footwear according to Figure 8 to 16 is a sandal provided with a coating, it consists of a top sheet 11 which is shape-retaining and made of wood foil or wood veneer, a basic body in the form of a foot form bed 12 made of plastic material and a strap (not shown in detail) holding the foot form bed to the foot. The top sheet 11 in the form of a thinwalled, shell-shaped form body is formed to match the arch of the foot just like the upper surface of the foot form bed 2. Just like in the preceding embodirnent, the top sheet 11 or the foot form ` bed 12 is accordingly provided, underneath the arch of the toes, with a bead 13 starting at the outer edge of the sole, rising towards the middle toe and then steeply dropping off into, and merging with, a depression 14 for the ball of the big toe. A
shallow depression 15 is provided for the heel.
The foot form bed 12 is provided with a coating 16 ~ 25 consisting of plastic material, fabric or cloth on those lat-; eral surfaces of the sandal which are visible in the finished sandal. This coating 16 is folded over on the edges of the upper and lower surface of the foot form bed. The foot form bed is provided for this purpose, essentially along the entire edge of its lower and upper surface, with one each peripheral ~7~
1 depression 17 and 1~ into which the coating 16 is placed. It - is substantial in this to take care that the depression 17 provided on the upper surface of the foot form bed 12 do not extend all the way out to the edge, but instead be spaced peripherally so that a ledge 19 remains circumferentially on the edge. The height of this ledge 19 is such that after the coating 16 is folded over and the top sheet 11 is applied to the foot form bed 12, a ridgeless transition between the top sheet 11 and the coating 16 covering the ledge 19 is provided. The steps (c.f. Figure 5, 6 and 14, 15) provided on the lower surface of the foot form bed serve, on the one hand, to receive the cover pulled down into the area of the sole and, on the other hand, to receive the ends of the straps or edges of the shafts, so that the finished footwear is provided with an approximately, plane outsole.
The device for the production of the footwear accord-ing to the invention as shown in Figure 17 is a two-part casting mould consisting of a lower mould 21 and an upper mould 22. The bottom plate and the closing device for closing the mould are of a form known per se and therefore not shown in detail. The mould cavity 23 is formed in the lower mould 21 and open on top.
A peripheral depression 24 is provided along the entire edge - of the mould cavity 23. The upper mould 22 is provided in the area of the open top side of the mould cavity 23 with projections forming the upper definition of the mould cavity and complementari~ly corresponding in shape to the upper surface of the foot form bed to be produced.
In order to produce the footwear, an appropriately measured amount of plastic material is poured into the mould open on top, then the preformed, shape-retaining top sheet 1 or ' - g _ .
~7~
. ~
1 11 is placed onto the lower mould or attached to the upper mould by means of catch pins. A further possibility is the attaching on the upper mold by vacuum suction. The top sheet 1 or 11 in this case is slightly larger so that it is supported by the peripheral depression 24 and clamped fest between upper mould 21 and lower mould 22, so that it forms a seal for the mould cavity. The mould is then closed by means of the upper mould 22 and the liquid plastic mass is hardened, which operation at the same time forms the top sheet 1 or 11 onto the foot form bed. After removal of the footwear from the mould, the protruding edge of the top sheet 1 or 11 is served or ground off.
The device for the production of the footwear according to the invention as shown in Figure 18 comprises a mould frame 15 30 having a bottom plate 31, a lower mould 32 and an upper -- mould 33 connected with the die or piston 34 of a closing cylinder not shown in detail. The mould cavity 35 is formed in the upper mould 36 which is also provided with an intake channel 36 for injection of the plastic material. The upper surface of the lower mould 32 matches the upper surface of the finished footwear, but is formed complementarily to this. Along the edge of the mould cavity 35, a peripheral depression 37 serving as a support for the top sheet 1 or 11 is provided in the lower mould 32.
For producing the footwear, the shape-retaining top sheet 1 or 11 is first placed into the mould. In this case, , the top sheet 1 or 11 is slightly larger in its dimension all around than the dimensions of the finished footwear, so that it is abuttingly supported on the peripheral depression 37, clamped fast by lowering of the upper mould 33 between it and ` l the lower mould 32 and thus serves as a seal for the mould - cavity 35. The curves of the top sheet ll, l can be more pronounced in all directions than this is intended in the finished footwear. The foot form bed is then formed by in-jecting the liquid plastic material and the top sheet l, ll is moulded onto it. The curves of the top sheet might - deform slightly so that a largely tensionless connection is achieved between the foot form bed and top sheet. This also applies to the embodiment according to Figure 17. Once the injection operation is finished, the protruding edge of the top sheet can be cut away just like in the preceding embodi-ment.
Suitable working materials for the top sheet are particularly wood foil, wood veneer, leather, fibrous material or the like. The shaping of the top sheet can be effected in various ways. The wood foil or wood veneer can be hot-pressed in a process of the known type or shaped by applying a vacuum according to the invention. The wood foil can also be coated with plastic material prior to shaping.
A particularly suitable working material for the basic body is polyurethane foam.
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;
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'
1 The invention relates to footwear, in particular to a sandal, sport shoe, house shoe or the like having an optionally coated foot form bed made of plastics and optionally an outsole.
. 5 The invention further relates to processes and ; devices for the production of this footwear.
; Footwear of the known type having a foot bed opti-mally adapted to the arch of the foot, the socalled foot form bed, supplies the natural support required for the human foot and to a large extent prevents malformations of the foot, i.e., of permanent deviations from the normal shape of the foot, such as flat or splay foot or the like, which impede the function of the foot. This type of footwear often has the form of sandals, especially exercise sandals, which are marketed provided with various coatings or also in the uncoated state. The foot form bed adapted to the arch of the foot consists entirely of wood or entirely of plastics.
The advantages of the foot form bed made of wood are the image of the natural product, high breaking strength and the ability to absorb moisture and thus prevent perspiration.
The disadvantages of wood are its comparatively high specific gravity, and the many processing operations required in produc-tion, such as sawing, milling, grinding and polishing. The advantages of the foot form bed made of plastics are elasticity, low specific gravity and few processing operations required in production. The disadvantages are impermeability to moisture - and the need to embed reinforcements for stiffening in many ....
cases.
It is the object of the invention to unite the advan-` 30 tages of these working materials and to provide footwear which .` ~
, .
1 is compatible to the shape of the foot and at the same time wear-resistant and easy to produce.
This object is achieved according to the invention in footwear of the type initially mentioned by providing on the upper side of the foot form bed, facing the foot, at least one preformed and shape-retaining top sheet made of wood, leather, fibrous material or similar porous and gripping mater-ial, preferably adapted in shape and size, the upper surface of the top sheet being curved conforming to the arch of the foot and the top sheet being fixedly connected to the foot form bed made of plastic material.
In this embodiment, the foot form bed adapted to the arch of the foot consists of two nondeformable and rigidly connected parts, with the anatomically correct position of the foot on the top sheet consisting of wood, leather, fibrous . material or the like porous and gripping materials being secured.
The grip, porosity and sweat-absorbing capacity of these working materials secure excellent tread and walking properties and, connected with the plastics materials, give the appropriate strength to the footwear. Being adapted to the arch of the foot particularly means that the upper surface of the top sheet below the arch of the toes is provided with a bead starting at the outer edge of the sole, rising towards the middle toe and then steeply dropping again, and merging with, a depression provided for the ball of the big toe.
According to the invention, the shape-retaining top sheet is embodied as a shell-shaped form body which is thin-walled in comparison to the foot form bed. The wall thickness of the form body is preferably uniform throughout, but it can also vary, for instance in order to achieve greater flexibility ~ .
~ ~ .
1 in the area of the ball than the jolnt. The shell-shaped form ; body can be produced completely separate from the basic body made of plastic material.
' In order to improve the connection between the S assembly and the basic body and the stiffness, it is practical in many instances to provide the shape-retaining top sheet on its underside facing the foot form bed with reinforcing materials, for instance plastic materials reinforced with fibres, option-ally with textile, glass ~der polyester fibers, in the form ; 10 of a coating.
According to a further favourable embodiment of the invention, the top sheet is fixedly connected, for instance by means of casting or injection moulding, to the foot form bed which preferably consists of foamed or expanded materials.
; 15 But it is also possible to connect the top sheet to the foot form bed by form-fitting or friction. For this purpose, it is practical to provide the top sheet on its lower side facing the foot form bed and abutting same with projections and/or recesses such as pegs, nubs or the like which are engageable with corresponding projections and/or recesses in the upper side of the foot form bed. These formations have the additional ad-vantage that the two individual parts making up the foot form .
bed can be produced, stored and shipped completely independent ~ from one another. Moreover, the top sheet and basic body can :~ 25 be simply replaced if necessary.
- In the process for the production of the footwear ` according to the invention, the liquid material intended for the production of the foot form bed is charged into a mould open on top. The process is characterized in that first, the top sheet is produced independent of the foot form bed made of '' :; ' ', ' :
1 plastic material and the shape-retaining top sheet is then applied to the open mould, with the top sheet preferably being slightly larger than the finished footwear so that the top sheet forms a seal for the mould cavity.
According to the process of the invention, the top sheet is Eormed by means of hot pressing. This method is known per se for the processing of wood.
According to a further embodiment of the process indicated above, the top sheet is formed by applying a vacuum.
This process step has the advantage that the sheet of wood is dried during the shaping, since the water content is sucked off by means of the vacuum to a large extent and within a short time without having to apply much heat to the mould.
` A further possibility is to apply a coating of liquid synthetic resin and optionally a reinforcement to the top sheet and subsequently pressing it.
~ further process according to the invention for the production of the subject footwear under use of a mould which is filled from the outside in a closed state by means of a pouring channel is characterized in that first, the top sheet if formed separately from the body of plastic material, for instance by means of hot pressing, vacuum shaping or pressing with synthetic resin, is then inserted in the preformed state into the mould cavity prior to the injection operation, and that the foot form bed is then formed onto the top sheet by ~ injecting plastic material into the mould cavity. This means - that the top sheet itself forms one of the definitions of the ` mould cavity, which greatly simplifies matters. This also applies to the process mentioned in the first place.
According to this process, the dimensions of the . - 4 -` ~9'7~0 preformed top sheet are, preferably all around, slightly larger than the dimensions of the finished footwear. The top sheet thus simultaneously secures a seal for the mould cavity and prevents the working material injected into the mould cavity from escaping to the upper surface, i.e., the treading surface, of the top sheet.
According to this process, it is further practical when the curves of the preformed top sheet on inserting it into the mould cavity are more pronounced, preferably in all directions, than the curves in the finished footwear. This makes possible an expansion compensation so that a largely tension-free connection between top sheet and basic body is achieved. This also applied to the process first mentioned.
The device according to the invention for carrying out the process first mentioned, with at least one upper mould and one lower mould movable in respect of one another, is characterized in that the mould cavity is formed in the lower mould and that the underside of the upper mould is formed - complementary to the upper surface of the top sheet, the upper 20 side of the lower mould being provided along the edge of the mould cavity with an, in particular peripheral, depression for supporting the top sheet.
The device according to the invention for carrying out the process mentioned in the second place, with a mould which is filled in the closed state from the outside through a pouring channel, consisting of at least one upper mould and at least one lower mould which are arranged movable in respect of one another, in particular in a moulding frame, is characterized in that the upper side of the lower mould is formed complementary to the upper surface of the top sheet and is provided with an, :' ' :
7q~
1 in partlcular peripheral, depression forming a support for the top sheet.
These devices secure a simple and rational connection - between the shape-retaining top sheet and the basic body or the forming of the basic body onto the top sheet.
The invention is explained in detail with reference to the accompanying drawing showing some embodiments of the object of the invention.
Figure 1 shows a top sheet for a first embodiment . 10 of the footwear according to the invention in perspective, Figure 2 the uncoated foot form bed associated with . the top sheet according to Figure 1, also in perspective, . Figure 3 a plan view of the footwear consisting of the top sheet according to Figure 1 and the foot form bed according to Figure 2, :. Figure 4 a section along line IV-IV in Figure 3, . Figure 5 a section along line V-V in Figure 3, Figure 6 a section along line VI-VI in Figure 3, . Figure 7 a section along line VII-VII in Figure 3, . 20 Figure 8 a top sheet for a second embodiment of . footwear according to the invention, .~ Figure 9 the foot form bed associated with the top sheet according to Figure 8, in perspective, ` Figure 10 the foot form bed according to Figure 9, .. 25 but without a coating, Figure 11 the footwear, in plan view, consisting of the top sheet according to Figure 8 and the foot form bed `. according to Figure 9, Figure 12 a section along line XII-XII in Figure 11, Figure 13 a detail of Figure 12 in enlarged scale, .
' :
1 Figure 14 a section along line XIV-XIV in Figure 11, Figure 15 a section along line XV-XV in Figure 11, Figure 16 a section along line XVI-XVI in Figure 11, Figure 17 a section of a first embodiment of a device according to the invention for the production of the footwear disclosed and Figure 18 a section of a second embodiment of a device according to the invention for the production of the footwear disclosed.
The footwear shown in Figure 1 to 7 has the form of an uncoated sandal and consists of a shape-retaining top sheet 1 of wood foil or wood veneer, a foot form bed 2 of plastic material and a strap (not shown in detail) by means of which the foot form bed is held to the foot. The top sheet 1, which is formed as a shape-retaining form body of shell-shape and is thin-walled in comparison to the foot form bed, just like the upper surface of the foot form bed 2 matches the arch of the foot. This means that the upper surface of the top sheet 1 or the foot form bed 2 according to Austrian Patent No. 233,437 is provided underneath the arch of the toes with a bead 3 starting at the outer edge of the sole, rising towards the middle toe -and steeply dropping off into, and merging with, a depression 4 provided for the ball of the big toe. A shallow depression ; 5 is provided for the heel.
The top sheet 1 is adapted in shape and size to the foot form bed serving as a basic body, it is fixedly connected to the foot form bed 2 by direct moulding, optionally under use of an adhesive agent. To improve the stiffness, it is - possible to coat the sheet 1 on its upper surface abutting the foot form bed 2 with reinforcing materials prior to this opera-~)7~
1 tion. It is essential that the top sheet 1 be shape-retaining and preformed, with the wall thickness of the top sheet 1 being uniform throughout, essentially, while it can also have walls of varying thickness, for instance in order to achieve greater flexibility in the area of the ball than in the joint.
The top sheet 1 preferably has a thickness of 0.5 to 3 mm, in the case of wood veneer, of in particular 0.5 to 1.2 mm, preferably 0.5 to 0.7 mm, when in the form of a sheet of plastic material, in particular of 1 to 3 mm.
The footwear according to Figure 8 to 16 is a sandal provided with a coating, it consists of a top sheet 11 which is shape-retaining and made of wood foil or wood veneer, a basic body in the form of a foot form bed 12 made of plastic material and a strap (not shown in detail) holding the foot form bed to the foot. The top sheet 11 in the form of a thinwalled, shell-shaped form body is formed to match the arch of the foot just like the upper surface of the foot form bed 2. Just like in the preceding embodirnent, the top sheet 11 or the foot form ` bed 12 is accordingly provided, underneath the arch of the toes, with a bead 13 starting at the outer edge of the sole, rising towards the middle toe and then steeply dropping off into, and merging with, a depression 14 for the ball of the big toe. A
shallow depression 15 is provided for the heel.
The foot form bed 12 is provided with a coating 16 ~ 25 consisting of plastic material, fabric or cloth on those lat-; eral surfaces of the sandal which are visible in the finished sandal. This coating 16 is folded over on the edges of the upper and lower surface of the foot form bed. The foot form bed is provided for this purpose, essentially along the entire edge of its lower and upper surface, with one each peripheral ~7~
1 depression 17 and 1~ into which the coating 16 is placed. It - is substantial in this to take care that the depression 17 provided on the upper surface of the foot form bed 12 do not extend all the way out to the edge, but instead be spaced peripherally so that a ledge 19 remains circumferentially on the edge. The height of this ledge 19 is such that after the coating 16 is folded over and the top sheet 11 is applied to the foot form bed 12, a ridgeless transition between the top sheet 11 and the coating 16 covering the ledge 19 is provided. The steps (c.f. Figure 5, 6 and 14, 15) provided on the lower surface of the foot form bed serve, on the one hand, to receive the cover pulled down into the area of the sole and, on the other hand, to receive the ends of the straps or edges of the shafts, so that the finished footwear is provided with an approximately, plane outsole.
The device for the production of the footwear accord-ing to the invention as shown in Figure 17 is a two-part casting mould consisting of a lower mould 21 and an upper mould 22. The bottom plate and the closing device for closing the mould are of a form known per se and therefore not shown in detail. The mould cavity 23 is formed in the lower mould 21 and open on top.
A peripheral depression 24 is provided along the entire edge - of the mould cavity 23. The upper mould 22 is provided in the area of the open top side of the mould cavity 23 with projections forming the upper definition of the mould cavity and complementari~ly corresponding in shape to the upper surface of the foot form bed to be produced.
In order to produce the footwear, an appropriately measured amount of plastic material is poured into the mould open on top, then the preformed, shape-retaining top sheet 1 or ' - g _ .
~7~
. ~
1 11 is placed onto the lower mould or attached to the upper mould by means of catch pins. A further possibility is the attaching on the upper mold by vacuum suction. The top sheet 1 or 11 in this case is slightly larger so that it is supported by the peripheral depression 24 and clamped fest between upper mould 21 and lower mould 22, so that it forms a seal for the mould cavity. The mould is then closed by means of the upper mould 22 and the liquid plastic mass is hardened, which operation at the same time forms the top sheet 1 or 11 onto the foot form bed. After removal of the footwear from the mould, the protruding edge of the top sheet 1 or 11 is served or ground off.
The device for the production of the footwear according to the invention as shown in Figure 18 comprises a mould frame 15 30 having a bottom plate 31, a lower mould 32 and an upper -- mould 33 connected with the die or piston 34 of a closing cylinder not shown in detail. The mould cavity 35 is formed in the upper mould 36 which is also provided with an intake channel 36 for injection of the plastic material. The upper surface of the lower mould 32 matches the upper surface of the finished footwear, but is formed complementarily to this. Along the edge of the mould cavity 35, a peripheral depression 37 serving as a support for the top sheet 1 or 11 is provided in the lower mould 32.
For producing the footwear, the shape-retaining top sheet 1 or 11 is first placed into the mould. In this case, , the top sheet 1 or 11 is slightly larger in its dimension all around than the dimensions of the finished footwear, so that it is abuttingly supported on the peripheral depression 37, clamped fast by lowering of the upper mould 33 between it and ` l the lower mould 32 and thus serves as a seal for the mould - cavity 35. The curves of the top sheet ll, l can be more pronounced in all directions than this is intended in the finished footwear. The foot form bed is then formed by in-jecting the liquid plastic material and the top sheet l, ll is moulded onto it. The curves of the top sheet might - deform slightly so that a largely tensionless connection is achieved between the foot form bed and top sheet. This also applies to the embodiment according to Figure 17. Once the injection operation is finished, the protruding edge of the top sheet can be cut away just like in the preceding embodi-ment.
Suitable working materials for the top sheet are particularly wood foil, wood veneer, leather, fibrous material or the like. The shaping of the top sheet can be effected in various ways. The wood foil or wood veneer can be hot-pressed in a process of the known type or shaped by applying a vacuum according to the invention. The wood foil can also be coated with plastic material prior to shaping.
A particularly suitable working material for the basic body is polyurethane foam.
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;
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. -- 11 --. .
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Claims (11)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A process for the production of footwear, in partic-ular sandal, sport shoe, or house shoe having a top sheet and a foot form bed made of a plastic material comprising pouring the liquid working material intended for the production of the foot form bed into a mold which is open on top, wherein the top sheet, which is separately formed and slightly larger than the finished footwear forms a seal with the mold cavity.
2. A process according to claim 1 wherein the top sheet is on the mold subsequent to the pouring of the liquid working material.
3. A process according to claim 2, wherein the top sheet is formed by means of hot-pressing.
4. A process according to claim 2, wherein the top sheet is formed by means of application of a vaccuum.
5. A process according to claim 2, wherein the top sheet is first coated with liquid synthetic resin.
6. A process according to claim 5, wherein the top sheet coated with a reinforcement subsequent to the cold pressing stop.
7. A process for the production of footwear, in particular sandal, sport shoe or house shoe, having a top sheet and a foot form bed made plastic material using a mould which is filled in the closed state from the outside through a pouring channel, wherein first the top sheet is produced separately from the body of plastic material by hot-pressing, shaping by means of vacuum or pressing with synthetic resin, then the top sheet in the preformed state is placed into the mould cavity prior to the injection operation and then the foot form bed is moulded onto the top sheet by means of injection of plastic material into the mould cavity.
8. A process according to claim 7, wherein the dimensions of the preformed top sheet, preferably all around, are slightly larger than the dimensions of the finished footwear.
9. A process according to claim 2, 7 and 8, wherein the curves of the preformed top sheet, preferably in all directions, are more pronounced at the time of insertion of the top sheet into the mould cavity than the curves of the finished footwear.
10. Device for carrying out the process according to any one of the claims 2, 3 or 4 having at least one upper mould and at least one lower mould arranged movable in respect of one another, wherein the mould cavity is formed in the lower mould and the underside of the upper mould is shaped complementarily to the upper surface of the top sheet, the upper side of the lower mould being provided along the edge of the mould cavity with a, particularly peripheral, depression serving as a support for the top sheet.
11. Device for carrying out the process according to any one of the claims 7, 8 or 9, having a mould which is filled in the closed state from the outside through a pouring channel and consists of at least one upper mould and at least one lower mould arranged movably in respect of one another particularly in a mould frame, wherein the upper side of the lower mould is formed complementarily to the upper surface of the top sheet and is provided with a, particularly peripheral, depression serving as a support for the top sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA290,089A CA1070110A (en) | 1977-11-02 | 1977-11-02 | Footwear, process and device for the production thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA290,089A CA1070110A (en) | 1977-11-02 | 1977-11-02 | Footwear, process and device for the production thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1070110A true CA1070110A (en) | 1980-01-22 |
Family
ID=4109931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA290,089A Expired CA1070110A (en) | 1977-11-02 | 1977-11-02 | Footwear, process and device for the production thereof |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1070110A (en) |
-
1977
- 1977-11-02 CA CA290,089A patent/CA1070110A/en not_active Expired
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| MKEX | Expiry |